Many mini-vans (like Kia, GMs, Dodge, Honda, etc. etc.) are FWD and rated to max 3,500 lbs trailer. This assume single 150 lbs driver and no other stuff inside the vehicle. And, the trailer doesn't have "window wall" drag. Wind drag is like towing a trailer for 300 more lbs. I have a 2009 mini-van and max pull with average gear and passengers in vehicle is 2,600 lbs. I once pulled a loaded 3,000 lbs utility trailer and one can feel it back there. Thus, my new max is a firm < 2,600 lbs trailer. When pulling above 1,500 lbs behind a mini-van, its best to have electrical brakes on the trailer as well. If wondering, my 17ft boat and 5x10 utility trailer have their own electric brakes. If trailer doesn't have brakes, the TV has high risk of wrapping from brake rotors during panic stops. Besting this risk, electric brakes on trailer behind mini van dramatically reduces braking distance as well. Especially when braking down hills. To reduct rear sag on my mini-van, I installed Timbren SES units. re: http://timbren.com/timbren-ses/
Unlike air bags, Timbren SES units are a simple "install and leave" product. No worry about air leaks or adjusting. If wondering, my boat and utility trailers cannot accept a WDS system. If pulling a PUP and/or RV/TT with your mini-van, I highly recommend using a WDS hitch (with properly sized bars).
Long mumblings short… Keep trailer weights under 2,600 lbs (with other stuff in mini-van) and take it easy. When towing, my mini-van is one of the slowest TV + trailer combos on the road. And, my vehicle thanks me for it…
Hope this helps.